<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 实现一个myForEach方法达到内置forEach效果 -->

    <script>
      var arr = ["张三", "李四", "王五"];
      arr.forEach(function (item, key, arr) {
        console.log(item, key, arr);
      });

      function myForEach(arr, fn) {
        for (var i = 0; i < arr.length; i++) {
          fn(arr[i], i, arr);
        }
      }

      myForEach(arr, function (item, key, arr) {
        console.log(item, key, arr);
      });
    </script>
  </body>
</html>
